Balanced throttle-valve



C. D. BARRETT, J. EIMYERS AND A. 0. KING.

BALANCED THROTTLE VALVE.

APPLICATION FILED SEPT. 16. 1920.

Patented Aug. 9, 19210 gems. W 0

entree stares career @FFHQE.

onnnnns :o. nnnr'r, JQHN n. rave, nnn ALBERT 0. KING, or sarcoma, PENN.

svnvnnrn.

BCED z' OTTLE-VALVE.

Application filed September 16, 1920. Serial No. 410,726.

To all whom it may concern:

Be it known that we, CHARLES D. BARRETT, JOHN E. MYERS, and ALBERT 0. KING, citizens of the United States of America, and residents of Altoona, county of Blair, State of Pennsylvania, have invented certain new and useful Improvements in Balanced Throttle-Valves, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

Our invention relates to throttle valves such as are. used in connection with locomotive engines and in which the throttle valve is more or less approximately balanced by a balancing piston and cylinder. As heretofore constructed it has been .found that in opening the valve and in-certain conditions of use it is very diificult and requires a great deal of power to move the valve from a position in which it is partly opened to a more open or fully opened position and this difficulty we have found to arise by reason of the application of a thin jet of steam when the valve first leaves its seat, which vsteam jet impinges upon the balancing piston with sufiicient force to unbalance the valve and make it very diflicult to move it from its seat. The object of our invention is to so deflect this jet formed on the initial opening of the valve that it will no longer impinge upon the balancing piston in such a way as to unbalance the valve and our invention consists, broadly speaking, in interposing a deflecting plate in the path of the jet which will prevent it from impinging on the piston in a manner to unbalance 1t.

The nature of our invention will be best understood as described in connection with the drawings in which it is illustrated, and in which- Figure 1 is a sectional elevation showing the throttle valve, its seat, balancing cylinder and piston and our improved deflecting plate in what we believe to be its best and most eflicient form of construction, and

Fig. 2 is a similar sectional elevation showing a modified form of application of our improved deflecting plate.

A indicates a dry pipe head having formed on it a seat A for the throttle valve and formed in it, as shown, a cylindrical pas sage A for the rod by which the valve is opened. B is the balancing cylinder; C is the throttle valve having formed through it a steam passage which connects with the Patented Aug. 9, 31921.

balancing piston D. Said passage has a valve-seat at its top and opens through the balancing piston. E is the pilot valve secured to the actuating stem E. In all of the above mentioned featuresthe construclnonillustrated is of agenerally familiar As shown, we form the throttle valve C with a lip or flange C for a purpose we will explain. Y

F is our improved deflecting plate which, as shown, is annular in form havin its lower edge F 2 secured to the top of the alancing cylinder B and curving inward from this edge so as to aflord a, clear steam space and upward at lts upper edge so that its top F lles nearly in contact with the top of the throttle valve when it is closed and nearly in contact with the flange C. By this construction we leave as much as possible of the under surface of the throttle valve in free commun cation. with the space above the balancing plston, and maintain approximately the same pressure on the' valve and plston. 4

ln Fig. 2 a indicates the top of the dry plpe, a the seat for the throttle valve, a and a the steam passages, b the balancing cylinder, d the balancing piston, c the throttle valve having the seat a for the pilot valve. e is the pilot valve and e" the stem connected with the pilot valve for actuating it and the throttle valve. In these features,

also, the construction is of a well known type and needs no further explanation.- indicates a deflecting plate which is shown here as connected to the valve seat directly below this seat portion: and extends out so that when the throttle valve is slightly open the deflecting plate F and will not come in contact with the piston or any attachment to the piston. The reason for the curved form given to the deflecting plate is to insure as far as possible that the pressure existing and a balancing piston attached thereto, a-

steam deflecting plate located in the steam passage between the valve and its piston so as to prevent the steam jet formed when the valve is first opened from so implnglng on the piston as to materially interfere with the balance of the valve.

2. In combination with a throttle valve and a balancing piston attached thereto, an annular steam deflecting plate extending over the piston cylinder so. as to prevent the impingement of the steam jet, formed when the valve is first opened, on the piston.

3. In combination with a throttle valve and a balancing piston attached thereto, an annular steam deflecting plate supported on and extending over the piston cylinder so as to prevent the impingement of the steam jet, formed when the valve ,is first opened, on the piston.-

4. In combination with a throttle valve and a balancing piston attached thereto, an annular steam deflecting plate extending teeaeve over the piston cylinder to a height which w111 bring the top edge close to the closed valve, said deflecting plate having its sides curved inwardly from the bottom and outwardly at ts top so as to protect the piston from the, impingement of the steam jet when the valve is first opened and maintain substantially constant pressure on the top of theplston and the bottom of the valve.

5. In combination with a throttle valve having a 11p, C and a balancing piston attached thereto, an annular steam deflecting plate extending over the piston cylinder, sa1d deflecting plate having its sides curved inwardlyat the bottom and outwardly at the top and 1ts top edge'lying close to the lip on the valve, so as to protect the piston from the-lmplngement of the steam jet when the valve is first opened, and to form with the inner walls of the throttle valve a chamber nearly closed, so that the under side of the top wall of the throttle valve and the top of the balancing piston are subjected to the same pressure and that the velocity of the steam passlng through the throttle valve does not have an impact or suction action on thelr surfaces, resulting in an unbalanced action ,on the valve.

' CHARLES D. BARRETT.

JOHN E. MYERS. ALBERT 0. KING. 

